10 SNMP
SNMP (Simple Network Management Protocol) is an internetstandard protocol for managing
devices on IP networks. SNMP exposes management data in the form of a hierarchy of variables in
a MIB (Management Information Base).
WCC Lite supports SNMP service which is not added to default build of firmware but can be installed
as a module. It enables user to collect data on various parameters of system:
•
CPU time
time spent for calculations of various processes:
user
time for user processes;
system
time for system processes;
idle
time spent idling;
interrupts
time spent handling interrupts.
•
CPU load average
CPU load average for 1, 5 and 15 minutes respectively;
•
Disk usage
:
total
total amount of storage in the device (in kB)
available
amount of storage available to store data (in kB)
used
amount of storage used in the device (in KB)
blocks used percentage
blocks (sectors) used to store data in a disk (in kB)
inodes used percentage
the inode (index node) is a data structure in a Unixstyle file
system that describes a filesystem object such as a file or a directory. Each inode stores the
attributes and disk block location(s) of the object’s data.
•
Memory usage
RAM usage statistics:
total
total amount of RAM in the device (in kB);
available
unused amount of RAM in the device (in kB);
shared
shared amount of RAM between multiple processes (in kB);
buffered
refers to an electronic buffer placed between the memory and the memory
controller;
cached
a portion of memory made of highspeed static RAM (SRAM) instead of the slower
dynamic RAM (DRAM) used for main memory;
•
Network interfaces:
MTU
maximum transmission unit to be sent over network;
speed
rate of network transmission;
physical address
unique MAC address assigned to a device;
tx/rx
: byte, packet, drop, error count;
•
System properties:
uptime
time since the device was turned on;
process uptime
time since the process has been started;
hostname
a label that is assigned to a device connected to a computer network;
name
name of the device (if defined);
location
location of the device (if defined).
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